The reactions of winter wheat stem rust resistance sources to stem, leaf and stripe rusts in 2014

Mert


The Central Research Institute for Field Crops, Turkey



Stem rust still remains an important threat to wheat with new races such as Ug99. In 2012 main season, some genotypes developed by Central Research Institute for Field Crops were sent to Kenya for screening to Ug99 and WWSRRN (winter wheat stem rust resistance nursery) was organized with resistant genotypes according to result. Addition to Ug99, the resistances to local stem rust, leaf rust and yellow rust races are important.  The aim of this study was  to determine reactions of 99 genotypes in WWSRRN  to local rust population in the seedling stage (for PSt, Pgt and Pt) and adult plant stage (for Pst and Pgt) at the research facilities of CRIFC in Ankara and Kastamonu (stem rust) during 2014 season. For adult plant test; the genotypes were inoculated with local Pst populations (virulent on Yr2,6,7,8,9,25,27,Sd,Su,Avs) and local Pgt populations (avirulent on Sr24, Sr26, Sr27, and Sr31). Stripe and stem rust development on each entry were scored using the modified Cobb scale when the susceptible check Little Club had reached 80S infection severity in June and August 2014, respectively. Coefficients of infections were calculated and values below 20 were considered to be resistant. For seedling test; the seedling was inoculated with local Pgt, Pt (avirulent on Lr9, Lr19, Lr24, and Lr28) and Pst populations. Stripe, leaf and stem rust development on each entry were scored after 14 days with 0-4 and 0-9 scale for leaf-stem rust and yellow rust, respectively. Thirty seven (37%) (seedling) genotypes and 39 (39%) (adult stage)  genotypes were resistant to local Pgt, 35 (35%) (seedling) were resistant to the local Pt, and 55 (56%) (seedling) and 59 (60%) (adult stage) genotypes were resistant to the local Pst populations. The resistance sources to stem, leaf, and stripe rust were determined with this research.